EP0906648A1

EP0906648A1 - Electric cell with sealed metal casing

Info

Publication number: EP0906648A1
Application number: EP98917242A
Authority: EP
Inventors: Thierry Starck; Jean-Marc Bouchonnier
Original assignee: GEC Alsthom T&D SA
Current assignee: Grid Solutions SAS
Priority date: 1997-04-08
Filing date: 1998-03-26
Publication date: 1999-04-07
Anticipated expiration: 2018-03-26
Also published as: FR2761825A1; WO1998045913A1; ES2178202T3; DE69806319D1; FR2761825B1; HK1020459A1; JP2000511760A; DE69806319T2; EP0906648B1

Abstract

Disclosed is a cell comprising a casing containing a three-phase disconnecting and isolating switch, which ensure interconnection between the bars and/or external electric cables connected inside the casing through sealed press leads. Said casing, being optimally cubic, comprises an isolating switch, the blades (7) of which are in contact in a service position with conducting studs (9); said studs are aligned horizontally and parallel to the front panel of the casing, and are borne by conducting bars (10) orthogonally arranged with respect to this surface, above the isolating switch and the disconnector in the casing. These bars are connected to press leads (17A, 17B, 17C), borne by a top panel (FS) of the casing. In a ground connection position, the blades are in contact with one of the grounding studs (11) borne by a horizontal reinforcing crosspiece (31), centrally arranged between lateral walls in the casing.

Description

Electrical cell with waterproof metal box

The invention relates to electrical power distribution cells, medium voltage, having a metal box in which electrical equipment is installed, this equipment including at least one circuit breaker and often a disconnector, the box being designed waterproof and commonly filled with a dielectric shielding gas and the electrical connections between the external connection conductors and the equipment housed in the box being effected by watertight current crossings An example of a medium voltage cell, with a sealed metal box filled with a gas of protection, is in particular provided by the German utility model G94201935 This cell comprises a box in and around which various elements of electrical equipment are placed The arrangement of the elements is carried out so as to obtain a great compactness and to make it possible to carry out all operating operations on the cell front panel However, this cell has a watertight waterproof box, the manufacture of which is delicate, because this box has a lower recess provided to allow the connection of the cables. In addition, the connecting conductors between the circuit breaker elements and the disconnecting elements have complicated shapes and relatively long lengths due to the fact differences in position existing between the circuit breaker elements provided for the different phases of electrical distribution, which are arranged in width in the box, and the disconnecting elements which are arranged in depth Another example of cell is provided by German patent application 29501081 9 This document presents a variant a longitudinal coupling comprising a set of busbars and a transverse coupling variant comprising two sets of ba ^r res in ette second variant, the side-to-side elements of the two switches with a major axis perpendicular to the front of the he cell involves the implementation of a waterproof box different from that provided for the first variant In addition, the various connecting conductors also have complicated shapes and relatively large lengths which cause unnecessary dissipation of energy by Joule effect

The invention therefore proposes a medium-voltage cell with a watertight metal casing which is simpler in shape and which makes it possible to house the electrical equipment elements necessary for the production of different variants, and in particular cells with longitudinal or transverse coupling in minimum volume and with minimum lengths of conductive connections between elements The electrical cell according to the invention comprises a sealed metal box containing at least one three-phase circuit breaker and a disconnector so as to ensure interconnection of external busbars and / or of external electric cables individually connected to the inside of the box at through watertight current bushings, the front circuit breaker of the breaking chambers arranged horizontally and perpendicularly to a front face of the box through which this circuit breaker is controlled, the disconnector at least two positions is also controlled through said front face and comprises movable knives each articulated on a load-bearing, conductive and fixed part, carried by at least one insulating support of an interrupting chamber to a movable contact to which this part is connected. According to a characteristic of the invention, the rectangular parallelepiped box and optimally cubic includes a disconnector whose knives mo biles are oriented at least approximately vertically in a position, called service, for which these knives are in contact with conductive pads which are aligned horizontally in parallel to the front face and which are located above the disconnector relative to the circuit breaker to the circuit breaker in the box and which are connected to first sealed current crossings carried by an upper face of the box According to a characteristic of the invention, the cell comprises first current crossings arranged on the upper face of the box in such a way that a first central current crossing is directly above the central block and movable knife of the disconnector and that the other two first current crossings are diagonally aligned with respect to this first central current crossing and are respectively connected to a different stud by a first individual busbar, these ba rres, parallel and arranged orthogonally to the front face, being positioned symmetrically vis-à-vis the first central passage in the box According to a characteristic of a variant of the invention, the box contains a disconnector additional to movable knives each articulated on a fixed conductive part carried by insulating supports of a breaking chamber to a contact to which this conductive part is connected, these movable knives being oriented vertically in a service position for which they are in contact with conductive pads, aligned horizontally in parallel to the front face, located above this additional disconnector relative to the circuit breaker in the box and connected to second crossings of watertight current carried by the upper face of the box, said additional disconnector being located behind the other disconnector with respect to the front face of the box

According to a characteristic of a variant of the invention, in a grounding position, said movable knives, at least approximately oriented horizontally, are each in contact with a grounding stud carried by a crosspiece of horizontal reinforcement disposed centrally between side walls of the box above the circuit breaker breaking chambers According to one characteristic of the invention, the box comprises a disconnector whose, in the sectioning position, the movable knives are electrically isolated from the pads connected to the first current bushings and earthing studs or these knives are rocked halfway between the two service and earthing positions According to a characteristic of a variant of the invention, the box has second bushings current arranged so that a second current crossing, called central, is directly above the central stud and the movable knife of the additional disconnector, that the other two second current crossings are diagonally aligned with respect to this second central current crossing and are respectively each connected to a different pad by a second individual busbar, these two second bars being positioned in a symmetrical manner With respect to the central bushing corresponding to the central stud of the additional disconnector in the box. According to a characteristic of a variant of the invention, the disconnector and the additional disconnector have their corresponding elements arranged in alignment and at the same horizontal level in the box as well as the first and second bars of the same phase According to a characteristic of a variant of the invention, the box is provided with external unipolar hanger tubes which each connect to the box at the level of household orifices in the rear part of the flat bottom wall of this box, which has each ensures the passage of a different conductive element, the latter penetrating into the box to connect to a fixed conductive part carried by at least one insulating support of an interrupting chamber with fixed contact to which this part is electrically connected and which each allow the connection of at least one unipolar electrical cable via a leaky leaktight current crossing at a end of the tube which contains it and oriented horizontally and towards the front of the box under which the tubes are positioned

According to a characteristic of a variant of the invention, the box is provided with straight, external unipolar tubes, which each connect to the box at the level of household orifices in the rear part of the flat bottom wall of this box, behind of those provided for possible single-pole hanger tubes, each of which ensures the passage of a different conductive element penetrating into the box to connect to a fixed conductive part carried by at least one insulating support of an interrupting chamber with fixed contact to which this part is electrically connected and which in particular each allow the connection of a phase of an external voltage transformer

According to a characteristic of a variant of the invention, the box comprises second watertight current crossings carried by the upper face of this box behind the first current crossings in an arrangement identical to that of the latter with respect to this the front face, these second crossings being respectively connected each to one of the first crossings by a conductive bar which is common to them and which is housed inside the box parallel to the upper face of the box, these bars being parallel to each other

According to a characteristic of a variant of the invention, the cell comprises a box in which the disconnector and the additional disconnector are symmetrically arranged with respect to a plane passing through the earthing studs, the additional disconnector having movable knives each mounted on a conductive carrier part fixed on at least one insulating support of a breaking chamber, the movable knives of the additional disconnector being electrically connected each to a fixed contact of one of the breaking chambers to the movable contact to which is electrically connected a movable knife of the disconnector accommodates in the same box According to a characteristic of a variant of the invention, the box comprises an additional disconnector having movable knives which are respectively positioned each with the movable knife of the same phase of the disconnector with which it is housed in the same box, on load-bearing, fixed and conductive parts, which are fixed on at least one fixed insulating support of the breaking chamber and which are electrically connected together by a connection which extends in the space existing between the cut to which the insulating support is affected and the crosspiece contained in the box

According to a characteristic of a variant of the invention, the cell comprises a box with disconnector and additional disconnector symmetrically arranged with respect to a plane passing through the grounding studs, the additional disconnector having movable knives each mounted on a fixed conductive support piece electrically connected to a fixed contact of one of the interrupting chambers by means of a fixed conductive piece, carried by at least one insulating support for this interrupting chamber, and of two conductive elements connected to crossings watertight and connected to each other outside the box through an insulated conductor and hanger and connectors allowing the mounting of current and voltage transformers outside the box, the conductive part, a first of the elements conductor, the conductor insulates, a second of the conductive elements and the fixed conductive part relating to a knife being electrically serial in that order

According to a characteristic of a variant of the invention, the cell comprises a box in which the additional disconnector has movable knives which are respectively positioned each with the movable knife of the same phase of the disconnector with which it is housed in the same box, on load-bearing, conductive parts, which are fixed on at least one fixed and insulating breaking chamber support and which are electrically connected to each other by a connection which extends in the space existing between the breaking chamber to which the insulating support is affected and the crosspiece that the box comprises According to another variant characteristic of the invention, the box comprises current crossings carried by the upper face of this box, intended to be connected to overhead distribution lines via of unipolar connecting conductors connected to the respective external parts of the current bushings, each conductor being provided with an insulating elastomeric sleeve which covers it at the end and which is fitted on the external part of the current bushing to which this conductor is connected

According to a characteristic of a variant of the invention, the box comprises current crossings intended to be connected to overhead distribution lines by means of unipolar connecting conductors which are provided with insulating elastomeric sleeves and around which are mounted current transformers, toroidal type According to a characteristic of a variant of the invention, the box is filled with a dielectric protection gas

The invention, its characteristics and its advantages are precise in the description which follows in conjunction with the figures mentioned below. Figure 1 presents a diagram of a cell called arπvee-depart according to the invention seen laterally and in section.

FIG. 2 shows a partial block diagram of a variant of departure cell assumed to be seen from above and fictitiously through the upper face of the box of this cell. FIG. 3 presents a diagram in lateral section of the variant of cell shown in figure 2

Figure 4 shows an electrical diagram of a so-called coupling cell according to Figure 3

FIG. 5 shows a diagram of a bar shifting start-up cell according to the invention, seen laterally and in section

Figure 6 shows a block diagram showing the busbar connections between two feeder cells via a longitudinal coupling cell

FIG. 7 shows a diagram of a variant of a longitudinal coupling cell provided with external measuring transformers accessible while the bars are energized

FIG. 8 shows an electrical diagram of the variant coupling cell according to FIG. 7

FIG. 9 shows a diagram of a variant of a double busbar cubicle

FIG. 10 shows an electrical diagram of the variant of double-busbar cubicle according to FIG. 9

Figure 1 1 shows a diagram of a variant cell arrangement for outdoor use with current bushings connectable to overhead lines Figure 12 shows a top view of a cell according to Figure 1 1

The example of a three-phase start-up cell shown in FIG. 1 comprises a box 1 of rectangular parallelepiped shape, optimally cubic, produced in a manner known to those skilled in the art to be waterproof

This box 1, here assumes sheet metal, is designed to contain various elements of electrical equipment including in particular the elements of at least one circuit breaker having three poles whose respective axes are oriented perpendicular to one of the walls of the box intended to constitute the front face of the cell, this wall being here referenced FA

The poles are arranged side by side in a horizontal plane, they are here assumed to be aligned behind that which is symbolized by one of its three interrupting chambers 2 These chambers are for example of the vacuum interrupting chamber type or chamber filled with a gas protective dielectric, such as SF6

An operating mechanism 3 of the circuit breaker is positioned in front of the box II comprises at least one operating connecting rod 4 which passes through the front face FA by a sealed crossing device 5 and which controls the breaking chambers 2 The latter are worn by insulating supports 6 which are fixed inside the box 1 on the wall constituting the front face FA

The box 1 is also designed to be able to contain the elements of at least one disconnector here assumes a three position which takes place above the poles of the circuit breaker This disconnector comprises three pairs of movable contact knives 7 which are directly articulated each on a carrier piece 8, conductive and fixed, mounted on the insulating supports 6 of a breaking chamber 2 in mobile contact of which this piece 8 is electrically connected bn only knives is shown here

In a so-called service position, the three movable knives 7 are in contact with three conductive pads 9 carried by conductive bars 10 disposed under the wall constituting the upper face FS of the cell. These bars 10 are here rectilinear and extend perpendicularly. on the front face FA of the box They are positioned above the disconnector relative to the circuit breaker in this box The knives are for example oriented vertically, as shown in dotted lines

In a so-called sectioning position, the movable knives 7 are moved away from the studs 9 so that sufficient sectioning distances between knives and studs 9 are respected. In this position, the knives are for example tilted halfway between the mentioned position. above and the one described below

In this position, called grounding, the movable knives 7 are in contact with three conductive pads 1 1 which are connected to an earth collector of the box, only one of these pads being represented. Each movable knife is for example oriented at less roughly horizontally, as shown in solid lines As known, the movable knives 7 are actuated by a control mechanism 12 outside the box 1 An operating rod 13 of the control mechanism passes through the front face FA by a sealed crossing device 5A identical or similar to the crossing device waterproof 5 mentioned above This rod acts on a mechanism comprising a shaft 1 5, levers 16 and insulating rods 16A The operating rod 13 acts on a lever which partially rotates the shaft 15 The latter drives three levers which control individually the passage of the movable knives 7 from one position to the other by means of the insulating rods In the present example, the shaft 15 is carried by bearings 18 fixed on the wall of the front face FA inside of the casing 1 Only one of the stages 1 8 is here represents

In a preferred embodiment, the studs 1 1 for earthing are carried by the same support which is for example a metal cross member 3 1 positioned in the central part of the box, between the two side walls of the latter this cross member also serving reinforcement and making it possible to improve the pressure resistance or possibly depression of the cell The conductive bars 10 are intended to be connected to external three-phase conductors A, B, C located outside the box by means of crossings of current 17 A, 17B, 17C carried by the wall constituting the upper face FS of this box Each current crossing carries a bar 10 which it is here supposed to connect to an external conductor, for example by a connector 14A, 14B or 14C Ce external conductor is for example one of the conductive bars of a three-phase set of bars located outside and above the box

In the exemplary embodiment proposed and as shown in FIG. 2, the three current crossings 17 A, 17B, 17C carried by the casing 1 are arranged diagonally, with respect to the front face FA on the upper face FS d 'rectangular and preferably square shape of this box, so that the current crossing of the central phase referenced 17C is directly above the corresponding stud 9 as well as the corresponding movable knife 7, when the latter is in the service position as well as as shown in Figure 1 The two other current crossings 17A, 17B, diagonally aligned on either side of the central phase current crossing 17C, are then connected to the pads 9 which correspond to them The corresponding connections are provided by the bars conductive 10 which are identical and positioned symmetrically with respect to the central phase bushing 17C and to the corresponding stud 9 in the box 1 In a preferred embodiment, the assembly forms by the functional elements contained in the box 1 between disconnector and bushings current, as described so far, is housed in the upper front part of the box, this part corresponding approximately to a quarter of this box Furthermore and as shown in Figure 1, external single-pole hanger tubes 19, of which only one is represented in FIG. 1, each is connected by a first end at the level of household orifices in the rear part of the flat bottom wall FI of the box 1 These tubes each allow the passage of a conductive element hanger 20, different , entering the box to connect to a fixed conductive part 21 carried by the insulating supports 6 of a breaking chamber 2 at the co ntact fixed from which this part 21 is electrically connected The second end of the unipolar tubes 19 is connected to a waterproof current bushing 22 here assumed to have a horizontal axis Each waterproof bushing 22 is here provided to allow connection from the front of one or of several unipolar electrical cables 0 per phase, this connection being made to the moven of connectors known per se The second ends of the unipolar tubes 19 possibly include a portion here provided horizontal making it possible to receive current transformers 23, external and of the type toric

Furthermore, in an alternative embodiment also proposed in FIG. 1, external unipolar tubes 24 are capable of being connected each by a first end at the level of household orifices in the flat bottom wall FI of the box 1 behind those household for the external unipolar tubes 19 if these are provided These tubes 24 which are here assumed to be straight each allow the passage of a different conductive element 25 which penetrates into the box to connect to a fixed conductive part 21 of one of the cut-off 2 The second end of each of the unipolar tubes 24 is provided with a watertight current bushing 26 here shown vertical Each watertight bushing 26 is here supposed to be provided to allow a connection of at least one connection element 27 in T provided for the connection of an external voltage transformer 28 An example of a coupling cell developed from a cell such as evoked above and comprising an additional disconnector is shown in Figure 3, it allows for example to make an arrangement according to an electrical diagram shown in Figure 4

Such an arrangement allows longitudinal coupling between a set of three-phase external conductors A, B, C connected to the current bushings 17A 17B, 17C and a set of three-phase external conductors A, B ', C connected to the current bushings 17'A, 17'B and 17'C arranged behind the previous ones on the upper face of the box 1 'The coupling is carried out here by 1 through a succession of elements comprising a movable knife disconnector 7 and a circuit breaker a breaking chambers 2, both analogous to those provided in FIG. 1, as well as an additional disconnector with movable knives 7 'In practice, this additional disconnector has its movable knives 7' each positioned respectively between a fixed contact of one of the breaking chambers 2 and one of the conductive bars 10 ′ as shown in FIG. 3 According to a preferred embodiment presented in FIG. 3, the additional disconnector which is included in the box 1 ′ of a cell similar to that previously detailed is also a three-position disconnector which is identical to the movable knife disconnector 7 These two disconnectors are symmetrically arranged with respect to a vertical plane, not shown and supposed to pass through the 1 1 earthing studs, this plane being parallel to the front face FA of the box

The movable knives 7 ′ of the additional disconnector are each articulated on a support piece 8 ′, fixed and conductive, itself carried by the insulating supports 6 of one of the interrupting chambers 2 in fixed contact with which this support piece 8 ′, is electrically connected in the box In the service position, the three movable knives 7 'are in contact with three conductive pads 9' which are carried by conductive bars 10 'situated above the additional disconnector in the box These knives are for example oriented vertically , as shown in dotted lines In the earthing position, the movable knives 7 'are each in contact with a stud connected to the earth collector of the box. In the embodiment shown, where the disconnectors are symmetrically installed with respect to a median vertical plane of the box which is assumed to be parallel to the wall constituting the front face FA, the pads connected to the ground are the pads 1 1 which can simultaneously also receive knives 7 and 7 'from the two disconnectors

Each movable knife is for example oriented at least approximately horizontally, as shown in solid lines In the sectioning position, the movable knives 7 are, for example, tilting halfway between the two positions mentioned above. The additional disconnector has a specific control mechanism which is external to the box 1 ', as does the control mechanism 12 a side of which it is located in front of said box This mechanism comprises an operating rod 13 ′, partially shown which passes through the front face FA by a waterproof crossing device identical or similar to the waterproof crossing device 5 mentioned above, from so as to go along one of the side walls of the box and to be articulated on one of the levers 16 'of a movement transmission mechanism by levers 16' and insulating rods 16'A similar to the mechanism with levers 16 and rods 16A The levers 16 'are carried by a rotary shaft 15' and three of them are connected to the knives 9 'by means of three insulating connecting rods 16', to ensure the movements of s movable knives 7 between the positions mentioned above The shaft 15 'is carried by bearings 18' fixed on the wall which is opposite the front face FA in the box

The conductive bars 10 ′ are intended to be connected to conductors, located outside the box, by means of current crossings 17 ′ A, 17 ′ B, 17 C carried by the wall constituting the upper face FS of this box Each current crossing 17'A, 17'B, 17'C makes it possible to connect a conductive bar 10 'located inside the box to a different external connection conductor A', B 'or C located at outside and above said box In the example presented in FIG. 3, connectors 14 ′ A, 14 ′ B and 14 ′ C are provided to ensure these connections and to allow their possible disconnection

As shown in Figure 2, the three current bushings 17'A, 17'B, 17'C are provided arranged diagonally on the upper face FS of this box, as are the bushings 17 A, 17B, 17C The bushing current 17'C of the central phase is positioned directly above the corresponding stud 9 'as well as the corresponding movable knife 7, when the latter is in the operating position The other two current crossings diagonally aligned on either side of the central phase current crossing are then connected to the pads 9 'which correspond to them The corresponding connections are provided by the bars 10' positioned symmetrically with respect to the vertical plane which passes through the central phase bushings 17C and 17'C and the studs 9 and 9 'and which is perpendicular to the plane defined by the front face FA In a preferred embodiment, the assembly formed by the functional elements contained in the box 1 between additional disconnector and current crossings 17'A, 17'B, 17'C, as described so far, is housed in the rear upper part of the box, this part also corresponding at least approximately to a quarter of this box It should be noted that in this embodiment the electrical connections between external busbars via the disconnectors and the circuit breaker are likely to be particularly short A variant of arrival-departure cell with box 1 "is presented in FIG. 5 it is developed from a arrival-departure cell with caisson 1 presented in FIG. 1 However, it differs in measurement or it has three additional current bushings in addition to the three current bushings 17A, 17B, 17C arranged diagonally, with respect to the front face FA of the box Les three additional current crossings 17 ′ A, 17 ′ B and 17 ′ C are arranged behind the previous ones on the upper face of the box 1 ", like those of a box cell 1 ′ as shown in FIG. 3

The connection between two current crossings relating to the same phase, such as 17A and 17A 'is ensured by a straight conductor bar, called a 10 "offset bar fixed to the two current crossings inside the 1" box, the three 10 "shift bars being identical and parallel to each other near the upper face FS

In the example shown in FIG. 5, external unipolar hanger tubes 19 are connected at the level of household orifices in the rear part of the flat bottom wall FI of the box Id 'in a manner similar to that provided at the level of the cell presented in figure 1

FIG. 6 shows an example of connection between two inlet and outlet cells with boxes 1 and 1 "by means of a box coupling cell 1 'aligned with one another The inlet and outlet cells with box 1 is assumed identical to that presented in figure 1

The box coupling cell 1 ′ is assumed to be identical to that shown in FIG. 3 The arrival-departure cell with box 1 "is assumed to be identical to that presented in FIG. 5

As shown in Figure 6, the arπvee-depart boxes 1 and 1 "each receive a different set of three-phase external conductors references A, B, C for one and A ', B', C for the other In the proposed embodiment the conductors of the two sets are parallel to each other and to the front face of the boxes in each set and aligned two by two from one set to the other They are also respectively connected to the current bushings 17A, 17B 17C located near the front face of the box or they terminate

In the example presented this connection between an external three-phase conductor and a current crossing is assumed to be carried out by a connector, such as the cross connectors references 14A, 14B, 14C for conductors A, B, C leading to the box 1 The boxes 1, 1 "of the arrival-departure cells are respectively connected to the box 1 'of the coupling cell by intermediate conductive bars which are preferably identical, these isolated and external bars being referenced AI, BI, CI between boxes 1 and 1 'and AI', BI, CI 'between boxes 1' and 1 'Connectors provide the connection of the intermediate bars to the current bushings which they unite, such as connectors references 14A1, 14B 1, 14C 1 at the level of box 1' for intermediate bars AI, BI, CI connecting this box to box 1

The coupling function of a set of three-phase external conductors is thus achieved using a single coupling cell composed using standardized elements, such as the circuit breaker, disconnectors and bars

The 1 "box arrival-departure cell fulfills the same function as a departure 1 arrival cell, that is to say it allows the supply of a cable departure from a set of external conductors via a circuit breaker and a disconnector It also makes it possible to compensate simply by means of 10 "bars the offset between current crossings of the same phase as introduced by the box of the cubicle 1 'coupling

Another example of a coupling cell box D is shown in FIG. 7, it allows an arrangement to be made according to an electrical diagram as shown in FIG. 8 This cell is developed from a coupling cell with a box 1 'as mentioned above, it is provided with an external conductive connection making it possible to connect the fixed contacts of the interrupting chambers 2 to the conductive carrying parts 8 "of the movable knives 7' of the additional disconnector This external connection is here equipped with transformers current 23 and voltage 28, external to the box These transformers are liable to be affected and in particular dismantled, if necessary, when the busbars are energized The coupling is carried out by means of a movable knife disconnector 7, a circuit breaker with breaking chambers 2 and a movable knife disconnector 7 '

The movable knives 7 ′ of the additional disconnector are here each articulated on a conductive carrying part 8 ", called auxiliary, slightly different from the carrying parts 8, 8 'This auxiliary carrying part 8" is here fixed on additional insulating supports 6 "doors by a fixed conductive part 21, identical to that provided in the cell presented in FIG. 1 The part 21 is fixed on the insulating supports 6 of the fixed contact of a breaking chamber 2 in an identical manner Each auxiliary carrier part 8 "is connected to a conductive element 25

External single-pole hanger tubes 19, similar to that shown in FIG. 1, are each connected by a first end at the level of household orifices in the rear part of the plane lower wall of the box. These tubes each contain a conductive element. hanger 20, which penetrates into the box to connect by a first end to a fixed conductive part 21 connected to the fixed contact of a breaking chamber 2, as previously A second end of each single-pole hanger tube 24 is provided with a bushing waterproof 22 which receives a T-connector 29, of known type A conductive bar 30, sheathed in insulation and mounted externally to the box, makes it possible to connect each conducting element 20 to that of the conducting elements 25 which corresponds to the same phase in the box Each busbar 30 is here connected to two current crossings 20 and 26 relating to the same phase by two connectors 27 and 29 , for example at the median sockets of the latter

In the proposed embodiment, the connectors 27 are positioned vertically with their respective center sockets facing forward and the connectors 29 are positioned horizontally with their respective center sockets facing downwards and the busbars 30, which are bent, are each mounted between the respective center taps of two connectors 27, 29 relating to the same phase Current transformers 23 and voltage transformers 28 are associated with the various conducting elements 20 and 25, in the same way as in the case of the box cell 1 presented in figure 1 They allow respectively a measurement of the current passing through the busbars 30 and of the voltage at these bars

From the moment when the two disconnectors contained in the box of a cell as shown in FIG. 7 are simultaneously in the earthing position, it is possible to access the transformers 23 and 28 associated with this box, then that the external busbars A, B, C and / or A ', B', C to which the cell is connected are energized II is in particular possible to dismantle the current transformers 23, after disconnection of the busbars 30 and of the connectors 29 An additional variant of a double busbar cubicle is presented in FIG. 9, it allows an arrangement to be made according to the electrical diagram present in FIG. 10

This diagram shows an example of a 1 '"cell box intended to allow the supply of a cable feeder from two sets of three-phase external conductors A, B, C and A', B ', C, here two sets bars, this box comprising a circuit breaker and two disconnectors 7 and 7 'like the boxes 1' and the D

The arrangement of the box 1 '"shown in FIG. 9 differs from the previous ones in that the disconnector with movable knives 7 and the disconnector with movable knives 7' have their knives of the same phase articulated on load-bearing parts 8 and 8 '" which are fixed on the insulating supports 6 and which are electrically interconnected two by two, as shown in FIG. 9 for the two parts 8 and 8 '"visible in this figure The connection established between two parts 8 and 8" "connected to the movable contact d 'one of the circuit breaker interrupting chambers 2 here has an elongated part which here extends parallel to this chamber between the space existing between the latter and the reinforcing cross member 3 1 which the box comprises

The connections between the fixed contact of each breaking chamber 2 and the external electric cables 0 is carried out in the same way as in the embodiment presented in FIG. 1

The double busbar cell mentioned above has the important advantage of using components already used with cells 1 and 1 ". The cell arrangement shown in FIG. 1 1 is more specifically adapted to the case where the cell, of "dead tank" type, according to the invention is intended to be used outdoors in connection with overhead lines to which at least some of the current crossings of the cell are connected The cell itself is similar to that presented in FIG. 3 apart from the fact that the current crossings of the box 1 "" which it comprises are optionally aligned there parallel to the front face FA in one or here two rows of three bushings as seen in FIG. 12 for the bushings respectively referenced 17A to 17C and 17 A 'to 17C In this case, the conductive pads 9 and possibly 9' which comprise the switch (es) are therefore located there directly each under a crossing to which this stud is electrically connected by a part of limited dimensions corresponding functionally to one of the bars 10 or 10 ′ of the embodiments previously described A sleeve made of insulating elastomeric material 32 covers a unipolar connecting conductor 33 for connection to one of the phase wires an overhead connection which is connected to the box 1 "" at one of the current crossings, such as 17C, carried by the upper face FS of the box This sleeve is fitted onto the external part of this current crossing, it is dimensioned in a manner known per se so as to allow the necessary dielectric distances to be obtained between phase conductors and between phase and earth conductors II comprises fins so as to increase the length of the creepage line The unipolar connecting conductors are bent in a manner known per se so as to increase the dielectric distances at the end of the bushings In a preferred embodiment, the insulating sleeves 32 comprise each a cylindrical part covered with a grounded conductive layer allowing each to come to cap and protect one or more current transformer (s) 34, of toric type, surrounding the unipolar conductor 33 which crosses the sleeve considers, this or these transformer (s) being posιtιonne (s) at the level of the external part of the current crossing concerned, for example on a cylindrical part of the sleeve fitted on this external crossing part and under a second part of the sleeve The conductive layer which each sleeve comprises ends in a flared or circular arc at the level of the second part, above the crossings, so as to reduce the electric field at the end of the conductive layer

The use of a box such as 1 "" according to the invention makes it possible to produce medium-voltage cells, gas-insulated for outdoor use and connection to overhead distribution lines, which include a circuit breaker, one or more disconnectors and some of the essential connecting electrical elements housed in a relatively small container by compared to known cell arrangements and this with standardized constituent elements, at least some of which are common to various variants of cells according to the invention To the extent that the electrically located disconnectors on either side of the circuit breaker are provided of the three-way type positions as indicated above, it is possible to earth or short-circuit either and / or the other of the upstream and downstream overhead lines connected to one or other of these disconnectors

An earthing is carried out for example with a disconnector whose knives are in the commissioning position and therefore connected to the current bushings, such as 17A, 17B, 17C, serving the line to be short-circuited by setting earthing position of the knives of the second disconnector and by closing the circuit breaker by taking advantage of the closing power on the short circuit specific to the latter The operation can of course be carried out in an equivalent manner by reversing the positions of the disconnector in the case where the line is served by current crossings 17 ', 17'B, 17 ^* C

When the disconnectors are in the disconnection position, it is possible to carry out checks on the circuit breaker, while the overhead lines are energized. This results in great ease of intervention and great operational safety for the operator.

It is of course planned to raise the box 1 "" by means of a support frame, not shown, so as to respect the minimum height provided for the live elements of such medium voltage installations. It is also planned to make boxes similar to the 1 "" box or the circuit breaker is directly connected to the current bushings, in the absence of a disconnector in the box The connecting elements necessary for such an arrangement are not shown here, they are for example conductive bars connecting each of the mobile or fixed contacts of the phase cut-out chambers of the circuit breaker each has an internal part of one of the current bushings carried by the wall constituting the upper face FS of the box

It is also planned to equip the bottom wall of a box 1 "" in the same way as the bottom part of one of the boxes 1, 1 "or 1 '" respectively present in Figures 1, 7 and 9, of so as to allow the connection of toroidal current or voltage transformers and external unipolar cables by means of appropriate connectors and sockets. This will not be further developed here, insofar as such equipment is achievable as indicated above in conjunction with the figures recalled above

According to a variant not shown of a cell, of the "dead tank" type, as defined above, the sealed current crossings 17 are fixed to one of the ends of inclined metal tubes fixed by another end to the box at the level of the household orifices in the upper face FS for these current bushings The difference in orientation between tubes is then chosen so that the necessary dielectric distance between the ends of the insulating sleeves with which the bushings are respectively fitted is respected These sleeves are then likely to be straight sleeves simpler and less expensive than those shown in Figure 1 1 In addition it is then possible to mount the current transformers, toroidal type, directly around the inclined metal tubes, which also simplifies the realization and assembly

Claims

1 / Electrical cell with a sealed metal box, containing at least one three-phase circuit breaker and disconnector, for interconnection of external busbars and / or of external electric cables individually connected to the inside of the box through sealed current crossings , the circuit breaker having breaking chambers (2) arranged horizontally and perpendicular to a front face (FA) of the box through which this circuit breaker is controlled as well as the disconnector, the latter comprising movable knives (7) between at least a so-called service position and a so-called sectioning position and articulated each on a support piece (8), conductive and fixed, carried by at least one insulating support (6) of a breaking chamber has a movable contact of which this piece is connected, characterized in that the rectangular, optimally cubic parallelepiped box has a disconnector whose movable knives are oriented s at least approximately vertically in the service position, for which these knives are in contact with conductive pads (9) which are aligned horizontally in parallel with the front face, which are located above the disconnector with respect to the circuit breaker in the box and which are connected to first sealed current crossings (17A, 17B, 17C) carried by an upper face (FS) of the box

2 / cell according to claim 1, characterized in that it comprises first current crossings arranged on the upper face of the box so that a first central current crossing (17C) is directly above the stud and the knife central mobile of the disconnector and in that the other two first current crossings are diagonally aligned with respect to this first central current crossing and are respectively each connected to a different pad by a first individual conductive bar (10), these bars, parallel and arranged orthogonally to the front face, being positioned in a svmetπque manner vis-à-vis the first central crossing in the box

3 / cell according to one of claims 1, 2, characterized in that it comprises a box containing an additional disconnector with movable knives (7 ') also articulated each on a fixed conductive part (8', 8 "or 8 '') carried by insulating supports (6, 6 ") of a breaking chamber (2) to a contact to which this conductive part is connected, these movable knives also being oriented vertically in a service position for which they are in contact with conductive pads (9 ') aligned horizontally in parallel to the front face, located above this additional disconnector relative to the circuit breaker in the box and connected to second sealed current crossings (17' A, 1 7'B, 17'C) carried by the upper face of the box, said additional disconnector being located behind the other disconnector relative to the front face of the box 4 / Cell according to one of claims 1 to 3, characterized in that, in a grounding position, the said movable knives, at least approximately oriented horizontally, are each in contact with a grounding stud (1 1) carried by a reinforcing crosspiece (3 1 ) horizontal arranged centrally between side walls of the box above the circuit breaker breaking chambers

5 / cell according to one of claims 1 to 4, characterized in that it comprises a disconnector whose, in the sectioning position, the movable knives are electrically isolated from the pads (9) connected to the first current crossings and from the setting pads to earth (1 1) included in the box, these knives being tilted halfway between the two service and earthing positions 6 / Cell, according to one of claims 3 to 5, characterized in that '' it includes second current crossings arranged so that a second current crossing, called central (1 7'C) is directly above the central block and movable knife of the additional disconnector, than the other two seconds current crossings (17'A, 17'B) are diagonally aligned with respect to this second central current crossing and are respectively each connected to a different pad by a second individual conductor bar (10 '), these two second bars being positioned symmetrically with respect to the central bushing corresponding to the central stud of the additional disconnector in the Il Cellule box, according to one of claims 3 to 6, characterized in that the disconnector and the additional disconnector have their corresponding elements (7, 7 'and 9, 9') arranged in alignment and at the same horizontal level in the box as well as the first and second bars (10, 10 ') of the same phase 8 / Cell, according to one of claims 1 to 7, characterized in that it comprises a box provided with external single-pole hanger tubes (19) which each connect to the box at the level of household orifices in the rear part of the flat bottom wall (FI) of this box, which each ensure the passage of a different conductive element (20), the latter penetrating into the box to connect to a fixed conductive part (21) carried by at least one insulating support (6) of an interrupting chamber (2) in fixed contact from which this part is electrically connected and which each allow the connection of at least one unipolar electric cable (O) via a watertight current bushing (22) housed at one end of the tube which contains it and oriented horizontally and towards the front of the box under which the tubes are positioned 9 / cell, according to one of claims 1 to 8, characterized in that it comprises a box provided with straight unipolar tubes (24), external, which are each connected to the box at the level of household orifices in the rear part of the planar lower wall of this box, behind those provided for possible single-pole hanger tubes, which each ensure the passage of a conductive element eur (25) different penetrating into the box to connect to a fixed conductive part (1) carried by at least one insulating support (6) of a breaking chamber (2) to the fixed contact of which this part is electrically connected and which in particular each allow the connection of a phase of an external voltage transformer (28) 10 / cell, according to one of claims 3 to 5, characterized in that it comprises second sealed current crossings (17'A , 17'B, 17'C) carried by the upper face (FS) of the box behind the first current bushings (1 7A, 17B, 17C) in an arrangement identical to that of these with respect to the front face (FA) of this box, these second crossings being respectively connected each to one of the first crossings by a conductive bar (10 ") which is common to them and which is housed inside the box parallel to the upper face of the box, these bars being parallel between they

IL cubicle, according to one of claims 3 to 7 characterized in that it comprises a box in which the disconnector (7, 9, 10) and the additional disconnector (7 ', 9', 10 ') are symmetrically arranged by relative to a plane passing through the earthing studs (1 1), the additional disconnector having movable knives (7 ′) each mounted on a conductive support piece (8 ′) fixed on at least one insulating support (6) a breaking chamber, the movable knives of the additional disconnector being electrically connected each to a fixed contact of one of the breaking chambers (2) to the movable contact of which is electrically connected a movable knife (7) of the disconnector housed in the same box 12 / cubicle, according to claim 9, characterized in that it comprises a disconnector box (7, 9, 10) and additional disconnector (7 ', 9', 10 ') are symmetrically arranged with respect to a plane passing through the earthing studs (1 1), the additional disconnector having movable knives each mounted on a fixed conductive carrier part (8 ") electrically connected to a fixed contact of one of the breaking chambers (2) by the intermediate of a fixed conductive part (21), which carries at least one insulating support ^~ (6) of this breaking chamber, and two conductive elements (25, 20) connected to sealed bushings (26, 22) and connections between them outside the box through an insulated conductor and hanger (30) and connectors (27, 29) allowing the mounting of current and voltage transformers outside the box, the conductive part (8 "), a first of the conducting elements (25), the insulating conductor (30), a se cond of the conductive elements (20) and the fixed conductive part (21) relating to a knife being electrically in series in this order

13 / cubicle, according to one of claims 3 to 9, characterized in that it comprises a box in which the additional disconnector has movable knives ^" (7 ') which are respectively positioned each with the movable knife (7) of same phase of the disconnector with which it is housed in the same box, on load-bearing (8.8 '"), conductive parts, which are fixed on at least one fixed and insulating support (6) of the breaking chamber and which are electrically connected together by a link which extends in the space existing between the breaking chamber to which the insulating support is affected and the crosspiece (3 1) that comprises the box 14 / cell, according to one of claims 1, 3 , 4, 5, 7, 8, 9, 1 1, characterized in that it comprises current bushings carried by an upper face (FS) of the box (1 ""), intended to be connected to overhead lines of distribution via unipolar connecting conductors (33) con nect to the respective external parts of the current bushings, each conductor being provided with an insulating elastomer sleeve (32) which covers it at the end and which is fitted on the external part of the current bushing to which this conductor is connected 15 / Cell, according to claim 14, characterized in that it comprises current crossings intended to be connected to overhead distribution lines by means of unipolar connecting conductors (33) which are provided with elastomeric insulating sleeves and around which are mounted current transformers, toroidal type, (34) 16 / cell, according to one of claims 1 to 15, characterized in that it is filled with a dielectric protection gas.